XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 194
XRT94L33IB-L
Manufacturer Part Number
XRT94L33IB-L
Description
IC MAPPER DS3/E3/STS-1 504TBGA
Manufacturer
Exar Corporation
Specifications of XRT94L33IB-L
Applications
Network Switches
Interface
Bus
Voltage - Supply
3.14 V ~ 3.47 V
Package / Case
504-LBGA
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
XRT94L33IB-L
Manufacturer:
Exar Corporation
Quantity:
10 000
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XRT94L33
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
Rev.1.2.0.
The Format of the ATM Cell that is Read from the “Transmit Cell Extraction” Buffer
As the user reads out the contents of an ATM cell from the “Transmit Cell Extraction” Buffer (via the
Microprocessor Interface), they will be expected to read this ATM cell data via a 32-bit wide register/buffer
interface. As a consequence, the user must read out 56 byte size ATM cells from the “Transmit Cell
Extraction” Buffer. The byte format of this 56-byte ATM cell is as illustrated below.
Figure 27: Byte Format of the ATM Cells that are read out from the “Transmit Cell Extraction” Memory
Header Bytes (4 Bytes)
HEC Byte (1 Byte)
User Defined Field (3 Bytes)
Cell Payload Bytes (48 Bytes)
As a consequence, the user must read out a total of 14 “32-bit” words from the “Transmit Cell Extraction”
buffer for each ATM cell that is read out of the Transmit Cell Extraction Buffer.
Procedure for Reading a Cell from the “Transmit Cell Extraction Buffer”
The user can read an ATM cell from the “Transmit Cell Extraction Buffer” within the Transmit ATM Cell
Processor block, by executing the following steps.
STEP 1 – Flush the contents of the “Transmit Cell Extraction Buffer”
This is accomplished by executing a “Transmit Cell Extraction Buffer” RESET. The user can perform this
“Cell Extraction Buffer” RESET by doing the following.
194
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